Qian Wang, Martin Cleven, Feng-Kun Guo, Christoph Hanhart, Ulf-G. Meißner, Xiao-Gang Wu, and Qiang Zhao Institut für Kernphysik, Institute for Advanced Simulation and Jülich Center for Hadron Physics, Forschungszentrum Jülich, D-52425 Jülich, Germany Helmholtz-Institut für Strahlenund Kernphysik and Bethe Center for Theoretical Physics, Universität Bonn, D-53115 Bonn, Germany Institute of High Energy Physics and Theoretical Physics Center for Science Facilities, Chinese Academy of Sciences, Beijing 100049, China (Received 19 December 2013; published 3 February 2014)